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锁磷剂的应用与推广加快了人们对镧改性粘土的不断研究。为了探讨2种制备方法所得的镧改性凹凸棒土吸附剂对水体中磷酸根的去除效果,首先制备了镧改性凹凸棒土(La-ATP)及镧改性酸活化凹凸棒土(La-H-ATP)2种吸附剂,然后在不同条件下研究比较了二者对磷酸根的吸附效果。结果表明:La-ATP和La-H-ATP对磷酸根吸附曲线适合Langmuir方程,饱和吸附量(qm)均大于12 mg·g~(-1)。高温有利于La-ATP和La-H-ATP对磷酸根的吸附,并且La-ATP的平衡吸附量(qe)在35、25和10℃条件下均大于La-H-ATP。在酸性条件下,La-ATP具有比La-H-ATP更好的除磷效果。两种吸附剂对磷酸根具有较好的吸附选择性,几种常见共存离子存在时的吸附量无明显变化。
Phosphorus application and promotion of phosphate accelerated the continuous study of lanthanum-modified clay. In order to investigate the effect of lanthanum-modified attapulgite adsorbent on the removal of phosphate in water, La-modified attapulgite (La-ATP) and lanthanum-modified acid activated attapulgite (La -H-ATP) two kinds of adsorbents, and then under different conditions to study the two of the phosphate adsorption effect. The results showed that the adsorption curves of La-ATP and La-H-ATP for phosphate were suitable for the Langmuir equation and the saturated adsorption capacity (qm) was more than 12 mg · g -1. The adsorption of phosphate on La-ATP and La-H-ATP was favored by high temperature, and the equilibrium adsorption capacity (qe) of La-ATP was higher than that of La-H-ATP at 35, 25 and 10 ℃. Under acidic conditions, La-ATP has a better phosphorus removal effect than La-H-ATP. Both adsorbents have good adsorption selectivity to phosphate, and there is no obvious change in the adsorption amount of several common coexisting ions.